I get overly pissed off, when I notice (even more over, when somebody points a finger at it) a problem with my grammar. I'm a bloody Finn and I'm supposed to make "random errors", since this is not my first language, but come on. English is the easiest language in the world. It's easier than my own language, which is really, really difficult to cope with completely.
Nevertheless, I do find English so simple, that the American users should know it. If they don't, they will get ridiculed by me, for obvious reasons.